Ryūta Kawabata

Deep-sea archeologist Hiroshi Ibuki is the member of the digging team working at the bottom of the sea hoping to uncover the origins of Earth's existence but instead uncovers a mysterious colony of bacteria which gives off light similar to the Aurora Borealis. The ancient bacteria, once revived, attempt to make the world habitable for themselves - a process that would bring Earth back to its early primal form, killing all current life in the process.

Aoki, a naive, gullible young girl, strays towards the party life instead of taking her school work seriously.

Katagiri Teppei (Takuya Kimura) is an advertisement designer, but he's forced to be transferred to the Sales Department because of his egocentric behavior. He is forced to adapt to a new working environment, which includes changing his appearance to create a more professional image as a salesman. He runs into Uesugi Riko (Takako Matsu) at work, who always fights with him, and his high school sweetheart, Mizuhara Sanae, whom he still loves only to find out that she's engaged to his brother, Soichiro. Things take an unexpected turn between them and later on leads to a complicated love triangle.